fix(protocol): ensure attca is parsed correctly #280
Conversation
WalkthroughThe recent updates enhance the attestation validation process by improving error handling and validation logic in the Changes
Possibly related issues
Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media? TipsChatThere are 3 ways to chat with CodeRabbit:
Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments. CodeRabbit Commands (invoked as PR comments)
Additionally, you can add CodeRabbit Configuration File (
|
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
There was a problem hiding this comment.
Actionable comments posted: 0
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (2)
- protocol/attestation.go (1 hunks)
- protocol/attestation_tpm.go (4 hunks)
Additional comments not posted (4)
protocol/attestation.go (1)
252-256: LGTM! But verify the SAN parsing logic.The changes correctly handle the
metadata.AttCAattestation type by parsing the SAN extension. Ensure that thetpmParseSANExtensionfunction is correctly implemented and integrated.protocol/attestation_tpm.go (3)
Line range hint
150-197:
Refactoring and error handling improvements look good!The refactoring of variable declarations and enhanced error handling improve readability and provide clearer error messages. Ensure that the new validation checks for EKU and Basic Constraints align with the specifications.
Verification successful
Validation checks for EKU and Basic Constraints are correctly implemented.
The OIDs for Extended Key Usage (2.5.29.37) and Basic Constraints (2.5.29.19) used in the code are standard and align with the specifications. The validation logic is correctly applied.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the new validation checks for EKU and Basic Constraints. # Test: Search for the usage of EKU and Basic Constraints OIDs and ensure they align with specifications. rg --type go 'oidExtensionExtendedKeyUsage|oidExtensionBasicConstraints'Length of output: 406
390-399: New variable and type declarations are well-organized!The addition of OID variables and the
tpmBasicConstraintstype improves code readability and organization. Ensure these are used consistently and correctly throughout the code.Verification successful
New variable and type declarations are correctly used!
The new OID variables and the
tpmBasicConstraintstype are consistently and correctly used in the codebase. Their integration into conditional checks and type declarations aligns with their intended purpose, enhancing the code's structure and clarity.
- Usage confirmed in
protocol/attestation_tpm.go.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of new OID variables and the `tpmBasicConstraints` type. # Test: Search for the usage of the newly added variables and type to ensure consistent and correct usage. rg --type go 'oidExtensionSubjectAltName|oidExtensionExtendedKeyUsage|oidExtensionBasicConstraints|tpmBasicConstraints'Length of output: 901
358-387: NewtpmParseSANExtensionfunction looks good!The function encapsulates the SAN parsing logic, improving modularity and error handling. Verify that the parsing logic correctly identifies and handles the required fields.
Verification successful
Verification Successful:
tpmParseSANExtensionFunctionThe
parseSANExtensionfunction is present and utilized withintpmParseSANExtension, ensuring that SAN parsing is handled methodically. This supports the robustness and modularity of thetpmParseSANExtensionfunction.
parseSANExtensionis implemented and used for SAN parsing.forEachSANis employed to iterate over SAN entries, indicating a structured parsing approach.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the robustness of the `tpmParseSANExtension` function. # Test: Search for the function implementation and ensure it correctly handles SAN parsing. ast-grep --lang go --pattern $'func parseSANExtension($_) { $$$ }'Length of output: 69
Script:
#!/bin/bash # Description: Search for any function related to SAN parsing in the Go codebase. # Use ripgrep to search for functions that might be related to SAN parsing. rg --type go --pattern 'func.*SAN.*\(' -A 5Length of output: 457
Script:
#!/bin/bash # Description: Search for any function related to SAN parsing in the Go codebase. # Correct the ripgrep command to search for functions that might be related to SAN parsing. rg 'func.*SAN.*\(' --type go -A 5Length of output: 1215
This fixes an issue where the attca attestation (TPM 2.0) was not properly parsed due to a nuance with how the AIK certificates conform to the spec and the critical extension parsing.
james-d-elliott
force-pushed
the
fix-tpm-san-extension-parsing
branch
from
ac23695
to
6aeb62b
Compare
There was a problem hiding this comment.
Actionable comments posted: 0
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (2)
- protocol/attestation.go (1 hunks)
- protocol/attestation_tpm.go (4 hunks)
Additional comments not posted (2)
protocol/attestation.go (1)
252-256: Review of new attestation type handling.The addition of a conditional check for
metadata.AttCAis a targeted enhancement to handle specific attestation types. This change seems to integrate well with the existing structure and should improve the attestation handling process by ensuring that the Subject Alternative Name (SAN) extension is parsed correctly when necessary.However, ensure that the
tpmParseSANExtensionfunction is robust and handles all possible edge cases, as errors in this function could lead to incorrect attestation data being accepted.protocol/attestation_tpm.go (1)
Line range hint
150-197: Review of changes toverifyTPMFormatfunction.The modifications to the
verifyTPMFormatfunction enhance the clarity and robustness of AIK certificate parsing and validation. The introduction of thetpmParseSANExtensionfunction as a separate method to handle SAN parsing is a good example of separation of concerns, which should make the code easier to maintain and extend.However, ensure that the error handling within the
tpmParseSANExtensionfunction is comprehensive and that all error messages provide clear, actionable information. Additionally, the consolidation of EKU checks and the handling of unprocessed critical extensions are significant changes that should be carefully reviewed to ensure they do not introduce new issues or overlook existing ones.Verification successful
Comprehensive Error Handling in
tpmParseSANExtensionFunction VerifiedThe
tpmParseSANExtensionfunction includes detailed error handling and provides clear, actionable error messages when parsing the Subject Alternative Name (SAN) extension. This ensures robustness in AIK certificate validation.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Verify that the error handling within the `tpmParseSANExtension` function is comprehensive. # Test: Search for the function implementation and unit tests. Expect: Comprehensive error handling and clear error messages. rg --type go -A 5 $'tpmParseSANExtension'Length of output: 653
Script:
#!/bin/bash # Retrieve the full implementation of the `tpmParseSANExtension` function for review. ast-grep --lang go --pattern $'func tpmParseSANExtension($_) { $$$ }'Length of output: 72
Script:
#!/bin/bash # Use `rg` to capture the full implementation of the `tpmParseSANExtension` function. rg --type go -A 20 'func tpmParseSANExtension'Length of output: 1448
This fixes an issue where the attca attestation (TPM 2.0) was not properly parsed due to a nuance with how the AIK certificates conform to the spec and the critical extension parsing.